JP2000099218A - Output circuit, input/output system, and data input/output method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an output circuit and input/output system having an open- drain output which minimizes power consumption, and the data output method using them. SOLUTION: Data output parts 11-i (i=1 to 8) receive actual data RDATi (i=1 to 8) from a storage element 19 and output intermediate data TDATAi (i=1 to 8) which are their inverted or non-inverted data in response to a control signal XCON. A control part 15 senses the large/small relation between the number of actual data RDATi having a data value '0' and the number of actual data RDATi having a data value '1' and generates the control signal XCON according to the result. Output pad parts 13-i +(i=1 to 8) output transmit data ADATi (i=1 to 8) according to the intermediate data TDATi. Output pad parts 13-i has open-drain structures. An auxiliary output pad part 17 receives the control signal XCON and provides an index signal XINDB for the outside. Consequently, when the number of data values having large current consumption is larger than the number of data values having small current consumption, the values of the outputted data are inverted and outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data output circuit, and more particularly to an output circuit and an input / output system having an output portion of an open drain structure consuming different amounts of current depending on the value of output data.

[0002]

2. Description of the Related Art In semiconductor devices such as memories, high integration and high speed are pursued. For high-speed operation,
An output unit having an open drain structure is applied to a semiconductor device.

[0003] An output section having an open drain structure has an output transistor whose drain terminal is in a floating state. An NMOS transistor or a PMOS transistor can be used as the output transistor.

However, for the sake of the operation speed and the convenience of the manufacturing process, the output transistor is generally an NMOS transistor having a source terminal connected to the ground voltage VSS and a gate terminal applied with actual data to be output. Adopted. Therefore, in this specification, the output transistor is NM
The case where the transistor is an OS transistor will be described as an example.

When outputting data, the drain terminal of the output transistor is connected to a terminating voltage Vterm through a terminating resistor.
Is linked to The actual data to be output is applied to the gate terminal of the output transistor.

Therefore, when the actual data is "0",
The output transistor is "turned off". Then, the voltage level of the output signal appearing at the drain terminal of the output transistor becomes the terminating voltage Vterm.

On the other hand, when the actual data is "1", the output transistor is turned on. Then, the voltage level of the output signal appearing at the drain terminal of the output transistor is a value obtained by subtracting the voltage drop due to the terminating resistor from the terminating voltage Vterm.

Therefore, the output data of the open drain output section is limited to only "1" which consumes current and "0" which consumes no current.

The open drain output unit is
It has a predetermined swing width to output “1” or “0” data. Therefore, a certain amount of current flows through the terminating resistor. As a result, when the output data is “1”, a considerable amount of current is consumed.

For example, when the resistance value of the terminating resistor is 20Ω, the terminating voltage Vter is used to secure a swing width of about 1V.
The amount of current flowing from m to the ground voltage VSS is about 50 mA. Therefore, when outputting eight output data having a data value of “1”, about 400 mA is required at the output part of the open drain structure.
(= 50mA × 8) current consumption increases.

However, such an increase in the amount of consumption current lowers the economic efficiency and causes a problem of shortening the life of the semiconductor device to which it is applied.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an output circuit having an open drain output unit for minimizing power consumption, an input / output system, and a data output method using the same.

[0013]

In order to achieve the above object of the present invention, a first aspect of the present invention is to provide a data value of A which consumes a current amount of a or a data value of A which is larger than a. b
The present invention relates to an output circuit for simultaneously outputting a large number of data having a data value of B consuming a current amount. The output circuit of the present invention senses a plurality of actual data having respective data values, and outputs a plurality of data output units for outputting respective intermediate data corresponding to the actual data in response to a predetermined control signal. And a control unit for generating the control signal activated by a magnitude relationship between the number of the actual data having the B data value and the number of the actual data having the A data value. The intermediate data is
If the number of the actual data having the data value of A is smaller than the number of the actual data having the data value of B, the actual data having the data value of A is inverted data of the actual data. Is greater than or equal to the number of the actual data having the B data values,
This is non-inverted data of the actual data.

Preferably, the control unit senses a value of the non-inverted data of the actual data and generates a non-inverted sensing signal driven by the non-inverted data having a data value of B. An inversion sensing unit that senses the value of the inversion data of the actual data and generates an inversion sensing signal driven by the inversion data having a data value of A, and a voltage level of the non-inversion sensing signal and the inversion sensing signal. And a comparator for generating the control signal.

In order to achieve the object of the present invention as described above, a second aspect of the present invention relates to a method of consuming a data value of A consuming a current amount of a or a current value of b larger than a. Do
The present invention relates to an input / output system for simultaneously inputting / outputting a large number of actual data having a data value of B. The input / output system according to the present invention, wherein the output device senses a data value of the actual data and provides transmission data corresponding to the actual data and an index signal indicating a relationship between the transmission data and the actual data, and the transmission device. An input device that receives data and the index signal and provides input data whose relationship with the transmission data is determined by the index signal to an internal circuit; The transmission data is inverted data of the actual data if the number of the actual data having the data value of A is smaller than the number of the actual data having the data value of B, and if the number is larger than the actual data, Is non-inverted data. The input data has the same data value as the actual data.

In order to achieve the above object of the present invention, a third aspect of the present invention relates to an output device for outputting a large number of data simultaneously. An output device according to the present invention stores a predetermined actual data, provides a data storage unit for providing a large number of the actual data in an output mode, and receives the actual data, and outputs intermediate data corresponding to a data value of the actual data. Is provided. The intermediate data, when the number of the actual data having the data value of A consuming the current amount of a is smaller than the number of the actual data having the data value of B consuming the current amount of b larger than the a Is the inverted data of the actual data, and when the number of the actual data having the data value of A is larger than the number of the actual data having the data value of B, it is the non-inverted data of the actual data. is there.

In order to achieve the object of the present invention as described above, a fourth aspect of the present invention relates to a method of consuming a data value of A consuming a current amount of a or a current value of b larger than a. Do
This is a data output method for simultaneously outputting data having a data value of B. The data output method of the present invention includes: A) sensing data values of a plurality of actual data having respective data values; and B) the number (m) of the actual data having the data value of A and the B value. Comparing the number (n) of the actual data having the data values of (C) and (C) the intermediate data by inverting the actual data when the comparison result of the step (B) is m ≦ n. , When m> n, non-inverting the actual data to generate the intermediate data, and D) generating an index signal indicating a correlation between the intermediate data and the actual data. .

In order to achieve the object of the present invention as described above, a fifth aspect of the present invention relates to a method of consuming a data value of A consuming a current of a or a current of b larger than a. Do
Input / output for simultaneously inputting / outputting data having a data value of B
This is a data input / output method for an input / output system having an output device. The data input / output method of the present invention includes: A) sensing data values of a plurality of actual data having respective data values, and B) the number (m) of the actual data having the data value of A and the The number of said actual data having a data value of B
comparing (n) and C) the comparison result of step B), m ≦
generating intermediate data by inverting the actual data if n, and generating the intermediate data by non-inverting the actual data if m> n, and D) generating the intermediate data. Generating an index signal indicating the correlation of the actual data; and E) generating predetermined input data for determining a correlation with the intermediate data in response to the index signal. The input data has the same data value as the actual data.

According to the present invention, when the number of data values consuming a large amount of current is greater than the number of data values consuming a small amount of current, the value of the data to be output is inverted and output. By doing so, the current consumption is reduced. Such a reduction in the amount of consumption current improves the economy of the product and extends the life of the product to which the product is applied.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS For a fuller understanding of the invention, its operational advantages, and the objects achieved by the practice of the invention, reference will be made to the accompanying drawings, which illustrate preferred embodiments of the invention. Reference should be made to the contents set forth in the accompanying drawings.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In each drawing, components denoted by the same reference numerals indicate the same components.

FIG. 1 is a diagram schematically showing an output device 100 including a low current operation output circuit 10 according to a preferred embodiment of the present invention. The low-current operation output circuit 10 according to a preferred embodiment of the present invention is a device that simultaneously outputs a large number of data having a data value of “0” or “1”. In the present specification, for the sake of convenience, the description will be given on the assumption that the low-current operation output circuit 10 outputs eight data simultaneously.

The data output section 11_i (i = 1 to 8) receives the actual data RDATi (i = 1 to 8) output from the storage element section 19 and outputs the corresponding intermediate data TDATi, i = 1 to 8 Occurs.

When the data value of the actual data RDATi is greater than “0” by “1”, the intermediate data TDATi is the inverted data of the corresponding actual data RDATi.

On the other hand, the data value of the actual data RDATi is "0"
When "1" is smaller, the intermediate data TDATi is non-inverted data of the corresponding actual data RDATi.

The control unit 15 senses the magnitude relationship between the number of actual data RDATis having a data value of "1" and the number of actual data RDATis having a data value of "0" and detects a control signal XCON
Is generated. Then, the control signal XCON is output to the data output unit 11_i
To determine the intermediate data TDATi and the actual data RDATi.

Output pad sections 13_i, i = 1 to 8 are intermediate data
The transmission data ADATi (i = 1 to 8) is generated in response to TDATi.
The output pad section 13_i has an open drain structure.
This embodiment will be described on the assumption that the output transistor of the output pad section 13_i is an NMOS transistor.

Therefore, the output pad section 13_i consumes a large amount of current when data "1" is input.
When data of “0” is input, the current is not substantially consumed.

The auxiliary output pad section 17 receives the control signal XCON and outputs an index signal XINDB to the outside.

FIG. 2 is a diagram showing a configuration example of the data output unit 11_i shown in FIG. In this configuration example, the data output unit 11
_i includes a dual output device 21 and a selector 23.

The dual output unit 21 receives the actual data RDATi and generates inverted data QIVBi (i = 1 to 8) and non-inverted data QIVi (i = 1 to 8) of the actual data RDATi.

It is preferable that the dual output device 21 is constituted by, for example, a D flip-flop.

The selector 23 receives the inverted data QIVBi and the non-inverted data QIVi of the actual data RDATi and receives the control signal XCON
And output the intermediate data TDATi.

That is, the intermediate data TDATi when the control signal XCON is activated is the inverted data of the actual data RDATi.
QIVBi. On the other hand, the intermediate data TDATi when the control signal XCON is inactivated is the non-inverted data QIVi of the actual data RDATi.

The selector 23 is preferably constituted by, for example, a 2: 1 multiplexer.

FIG. 3 is a diagram showing a configuration example of the control unit 15 shown in FIG. The control unit 15 according to this configuration example includes a non-inversion sensing unit 31, an inversion sensing unit 33, and a comparator 35.

The non-inversion sensing unit 31 senses the value of the non-inversion data QIVi of the actual data RDATi. And the non-reversing sensor
31 generates a non-inverted sensing signal XREV1 whose voltage level decreases according to the number of non-inverted data QIVi having a data value of "1".

More specifically, the non-inverting sensing unit 31 includes the first N
It includes a MOS transistor 31a_i (i = 1 to 8) and a first resistance element 31b.

The first NMOS transistor 31a_i (i = 1 to 8)
The ground voltage VSS is connected to the source terminal, and the gate terminal is
Non-inverted data QIVi of the corresponding actual data RDATi is applied.

The first resistance element 31b is connected to the first NMOS transistor 3
Connect the drain terminal of 1a_i to the power supply voltage VCC. Then, the signal of the drain terminal of the first NMOS transistor 31a_i is output as the non-inversion sensing signal XREV1.

Therefore, as the number of the non-inverted data QIVi whose data value is "1" increases, the voltage level of the non-inverted sensing signal XREV1 decreases accordingly. That is, as the number of the actual data RDATi whose data value is “1” increases, the voltage level of the non-inversion sensing signal XREV1 decreases.

The inversion sensing unit 33 senses the value of the inversion data QIVBi of the actual data RDATi. And the inversion sensing unit 33
Generates an inverted sense signal XREV2 whose voltage level decreases according to the number of inverted data QIVBi whose data value is "1".

More specifically, the inversion sensing unit 33 includes the second NMO
An S transistor 33a_i (i = 1 to 8) and a second resistance element 33b are provided.

The second NMOS transistor 33a_i (i = 1 to 8)
The ground voltage VSS is connected to the source terminal, and the inverted data QIVBi of the actual data RDATi is applied to the gate terminal.

The second resistance element 33b is connected to the second NMOS transistor 3
Connect the drain terminal of 3a_i to the power supply voltage VCC. Then, the signal of the drain terminal of the second NMOS transistor 33a_i is output as the inverted sense signal XREV2.

Therefore, when the number of the inverted data QIVBi whose data value is “1” increases, the inverted sense signal XREV2 becomes:
The voltage level drops accordingly. That is, the voltage level of the inverted sense signal XREV2 decreases as the number of the actual data RDATi whose data value is “0” increases.

The comparator 35 compares the voltage levels of the non-inverted sensing signal XREV1 and the inverted sensing signal XREV2, and outputs the control signal XCONV
Occurs. Specifically, the non-inverting sensing signal XREV1 is applied to the inverting input terminal (-) of the comparator 35, and the inverting sensing signal XREV2
Is applied to the non-inverting input terminal (+) of the comparator 35. The comparator 35 is designed to be deactivated when a voltage level equal to the inverting input terminal (-) and the non-inverting input terminal (+) is input.

Therefore, when the voltage level of the non-inverted sensing signal XREV1 is lower than the voltage level of the inverted sensing signal XREV2, the control signal XCON is activated. That is, when the number of actual data RDATi whose data value is "1" is larger than the number of actual data RDATi whose data value is "0", control signal XCON is activated to "high".

However, if the voltage level of the non-inverted sensing signal XREV1 is higher than or equal to the voltage level of the inverted sensing signal XREV2, the control signal XCON is deactivated. That is, the actual data RDATi whose data value is “0”
If the number of actual data RDATi whose data value is "1" is smaller than or equal to the number of the control signals XCON, the control signal XCON is deactivated to "low".

FIG. 4 is a diagram showing a configuration example of the output pad section 13_i shown in FIG. Output pad section 13 according to this configuration example
_i includes an output transistor 41 and a termination resistor 43.

The output transistor 41 has a source terminal connected to the ground voltage VSS and a gate terminal connected to the intermediate data TDATi.
Is applied to the NMOS transistor. The terminating resistor 43 is
The terminal voltage Vterm is connected to the drain terminal of the output transistor 41. The drain terminal of the output transistor 41 outputs transmission data ADATi.

Therefore, when the intermediate data TDATi is "1", the output pad section 13_i consumes a considerable amount of current (about 50 mA). However, when the intermediate data TDATi is “0”,
The output pad section 13_i does not consume current.

Tables 1 and 2 show data of the intermediate data TDATi and the data of the control signal XCON when the number of actual data RDATi having a data value of "1" is larger than the number of actual data RDATi having a data value of "0". Indicates a value.

[0054]

【table 1】 Table 1 shows a case where all the data values of the actual data RDATi are “1”. In this case, the data value of the control signal XCON becomes “1”, and the intermediate data TDATi becomes the actual data RDATi.
Indicates that the data is inverted. Note that X indicates that the control signal XCON does not exist when the configuration of the low current operation output circuit according to the preferred embodiment of the present invention is not adopted.

Assume that the actual data RDATi is not inverted and ADATi
If the resistance value of the termination resistor is 10Ω and the swing width is 1V, the consumption current
Approximately 400 mA (= 50 mA ×
8).

However, when ADATi is output in accordance with the intermediate data TDATi which is the actual data RDATi inverted, the consumption current is only about 50 mA, which is the current consumed by the output of the control signal XCON. Therefore, the low-current operation output circuit 10 according to the preferred embodiment of the present invention
The current consumption of 0 mA is saved.

[0057]

[Table 2] Table 2 shows a case where there are five actual data RDATis having a data value of “1” and three actual data RDATis having a data value of “0”.

In this case, the data value of the control signal XCON becomes "1", indicating that the intermediate data TDATi is the inverted data of the actual data RDATi.

It is assumed that the actual data RDATi is not inverted and ADATi
In this case, the amount of consumption current is about 250 mA (= 50 mA × 5), which is the amount of current consumed by the five output pad sections 13 — i under the above conditions.

On the other hand, when ADATi is output according to the intermediate data TDATi which is the actual data RDATi inverted, the consumption current is about 150 mA (= 50 mA × 3) which is the current consumed by the three output pad sections 13 — i. ) And about 50 mA, which is the amount of current consumed by the output of the control signal XCON.
Therefore, the total consumption current is about 200 mA. Therefore, the low-current operation output circuit 10 according to the preferred embodiment of the present invention saves about 50 mA of current consumption.

Table 3 shows the number of actual data RDATi having a data value of "1" and the actual data RDATi having a data value of "0".
The intermediate data TDATi and the display signal XIND when the number of i is equal
Indicates the data value of B.

[0062]

[Table 3] Table 3 shows a case where the number of actual data RDATi whose data value is “1” is four and the number of actual data RDATi whose data value is “0” is four.

In this case, the data value of the control signal XCON becomes "0", indicating that the intermediate data TDATi is non-inverted data of the actual data RDATi.

When the actual data RDATi is non-inverted and output as ADTAi, the consumption current is about 200 mA (= 50 m), which is the current consumed by the four output pad sections 13_i.
A × 4).

On the other hand, if ADATi is to be output according to the intermediate data TDATi which is the actual data RDATi inverted, the consumption current is about 200 mA (= 50 mA × 4) which is the current consumed by the four output pad sections 13_i. ) And about 50 mA, which is the amount of current consumed by the output of the control signal XCON. That is, the total consumption current is about 250 mA. Therefore, when outputting according to the intermediate data TDATi which is the actual data RDATi inverted, the current consumption of about 50 mA increases.

Therefore, the number of actual data RDATi having a data value of “1” and the actual data RDATi having a data value of “0” are
If the number of ATis is equal, the intermediate data TDATi is the actual data
RDATi non-inverted data.

As described above, according to the low current operation output circuit 10 according to the preferred embodiment of the present invention, about 25% of current consumption is omitted.

FIG. 5 is a diagram showing a configuration example of a low current operation input / output system according to a preferred embodiment of the present invention.
As shown in FIG. 5, a low-current operation system 1 according to a preferred embodiment of the present invention includes an output device 100 and an input device 200.

The internal configuration and operation of the output device 100 are as shown in FIG. That is, the output device 100 outputs the actual data RDATi when the number of actual data RDATi having a data value of “1” (not shown in FIG. 5) is larger than the number of actual data RDATi having a data value of “0”. Is inverted and the transmission data ADATi is output.

On the other hand, if the number of actual data RDATi having a data value of “1” is smaller than or equal to the number of actual data RDATi having a data value of “0”, the output device 100 Data RDATi is non-inverted and transmission data ADATi
Is output.

Next, the input device 200 will be specifically described.

The input device 200 receives the transmission data ADATi and the index signal XINDB and generates input data IDATi (i = 1 to 8). Index signal XINDB has the opposite logic state to control signal XCON.

Then, the input data IDATi is converted to the index signal XIN
When the DB is activated, the logical state becomes equal to the inverted data of the intermediate data TDATi. On the other hand, the input data IDATi
Indicates that when the display signal XINDB is deactivated, the intermediate data T
The logical state is equal to the non-inverted data of DATi.

Therefore, input data IDATi has a data value equal to actual data RDATi.

The input device 200 includes a plurality of data input circuits 5
5_i (i = 1 to 8). The data input circuit 55_i receives the transmission data ADATi corresponding to each, and outputs the index signal XIN
The input data IDATi is controlled by the DB.

FIG. 6 is a diagram showing a configuration example of the data input circuit 55_i shown in FIG. In this configuration example, the data input circuit 55_i includes a dual output device 61 and a selector 63.

The dual output unit 61 receives the transmission data ADATi and outputs inverted data QINBi and non-inverted data QINi of the transmission data ADATi.

The selector 63 receives the inverted data QINBi and the non-inverted data QINi of the transmission data ADATi, and outputs the index signal XINDB
To output the input data IDATi.

That is, the input data IDATi when the index signal XINDB is activated has a data value equal to the inverted data QINBi of the transmission data ADATi. On the other hand, the index signal XIN
Input data IDATi when DB is deactivated has a data value equal to non-inverted data QINi of transmission data ADATi.

Therefore, the input data IDATi is equal to the actual data R
It has a data value equal to DATi.

Although the present invention has been described with reference to the specific embodiments shown in the drawings, this is only an example,
Those of ordinary skill in the art will recognize that various modifications can be made to the specific embodiment and other equivalent embodiments can be employed. .

For example, in the above embodiment, the output transistor of the output pad section 13 — i is constituted by an NMOS transistor, but may be constituted by a PMOS transistor. In this case, the source terminal of the output transistor may be connected to the power supply voltage, and the drain terminal of the output transistor and the termination voltage may be connected to the termination resistor. When the output transistor is formed of a PMOS transistor as described above, a large amount of current is consumed when outputting a data value of “0”. Therefore, when the output transistor is configured by a PMOS transistor, the control signal XCON is the actual data RDATi having the data value of “1” and the actual data RDATi having the data value of “1”.
When the number is larger than i, it is necessary to design to be activated.

Further, in the above embodiment, an example is described in which the low-current operation output device outputs eight data at the same time, but it goes without saying that the number of simultaneously output data can be increased or decreased. No.

Therefore, the true technical scope of the present invention is:
It is to be determined by the spirit of the appended claims.

[0085]

According to the present invention, when the number of data values consuming a large amount of current is larger than the number of data values consuming a small amount of current, the value of the output data is inverted. Output reduces current consumption. Such a reduction in consumption current improves the economy of the product and extends the life of the product to which the product is applied.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating an output device including a low-current operation output circuit according to a preferred embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a data output unit illustrated in FIG. 1;

FIG. 3 is a diagram illustrating a configuration example of a control unit illustrated in FIG. 1;

FIG. 4 is a diagram illustrating a configuration example of an output pad unit illustrated in FIG. 1;

FIG. 5 is a drawing showing a specific example of a low current operation input / output system employing a low current operation output circuit according to a preferred embodiment of the present invention.

6 is a drawing illustrating a configuration example of a data input circuit illustrated in FIG. 5;

[Explanation of symbols]

 10 Low current operation output circuit 11 Data output section 13 Output pad section 15 Control section 19 Storage element section 100 Output device ADAT Transmission data QIV Non-inversion data QIVB Inversion data RDAT Actual data TDAT Intermediate data XCON Control signal XINDB Display signal

Claims (25)

[Claims] 1. An output circuit for simultaneously outputting a large number of data having a data value of A consuming a current amount of a or a data value of B consuming a current amount of b larger than a, A plurality of data output units for respectively detecting a plurality of actual data having data values and generating respective intermediate data corresponding to the actual data in response to a predetermined control signal; and A control unit that generates the control signal that is activated according to the magnitude relationship of the number of the actual data having the data value of B with respect to the number of the actual data, wherein the intermediate data is the data value of the A If the number of the actual data having the data value of A is smaller than the number of the actual data having the data value of the B, the actual data having the data value of A is inverted data of the actual data. Wherein when it is both or indeed greater than the number of data is the same, the the actual non-inverted data of the data output circuit, wherein the number of has a data value of the B. 2. The non-inverting sensing unit senses a value of the non-inverting data of the actual data and generates a non-inverting sensing signal driven by the non-inverting data having a data value B. The value of the inverted data of the actual data is sensed, and the data value is
An inversion sensing unit for generating an inversion sensing signal driven by the inversion data, which is A; and a comparator for comparing the voltage levels of the non-inversion sensing signal and the inversion sensing signal to generate the control signal. 2. The output circuit according to claim 1, comprising: 3. The control signal is deactivated when the number of the actual data having the B data value is equal to the number of the actual data having the A data value. Item 2. The output circuit according to Item 2. 4. The non-inverting sensing unit includes a first NMOS transistor having a source terminal connected to a ground voltage and a corresponding non-inverted data of the actual data applied to a gate, a drain terminal of the first NMOS transistor, and a power supply. A first resistance element for connecting a voltage, wherein the inversion sensing unit has a source terminal connected to the ground voltage, and a second NMOS transistor to which a corresponding inverted data of the actual data is applied to a gate; and a second NMOS transistor. 4. The output circuit according to claim 3, further comprising a drain terminal of the transistor and a second resistance element connecting the power supply voltage. 5. Each of the data output units receives the actual data and outputs inverted and non-inverted data of the actual data, and receives inverted and non-inverted data of the actual data. The output circuit according to claim 1, further comprising: a selector that outputs the intermediate data. 6. The output circuit according to claim 5, wherein the dual output device includes a D flip-flop. 7. The selector outputs inverted data of the actual data in response to activation of the control signal, and outputs non-inverted data of the actual data in response to inactivation of the index signal. 6. The output circuit according to claim 5, wherein: 8. An input / output system for simultaneously inputting / outputting a large number of actual data having a data value of A consuming a current amount of a or a data value of B consuming a current amount of b larger than a. An output device that senses a data value of the actual data and outputs transmission data corresponding to the actual data and an index signal indicating a relationship of the transmission data to the actual data; andthe transmission data and the display signal. An input device for receiving and outputting input data whose relationship with the transmission data is determined by the index signal to an internal circuit, wherein the transmission data is the number of the actual data having the data value of A. If the actual data having a data value of B is smaller than the number of the actual data, the data is inverted data of the actual data. An input / output system, wherein the data has the same data value as the actual data. 9. The output device, comprising: a plurality of data output units for generating intermediate data corresponding to the actual data; a plurality of output pad units having an open drain structure for outputting the intermediate data; And an auxiliary output unit that generates an index signal indicating a correlation between the actual data and the intermediate data, wherein the number of the actual data having the data value of A is the number of the actual data having the data value of B. 9. The low current operation input / output system according to claim 8, wherein when the number is smaller than the number, the actual data is inverted data, and when the number is larger, the actual data is non-inverted data. 10. Each of the data output units receives the actual data and outputs inverted and non-inverted data of the actual data, and receives inverted and non-inverted data of the actual data. 10. The low current operation input / output system according to claim 9, further comprising: a selector for outputting the intermediate data. 11. The input / output system according to claim 10, wherein the dual output unit includes a D flip-flop. 12. The control unit that generates a control signal that is activated when the number of the actual data having the B data value is smaller than the number of the actual data having the A data value. The selector outputs inverted data of the actual data in response to activation of the control signal, and outputs non-inverted data of the actual data in response to inactivation of the control signal. 11. The low current operation input / output system according to claim 10, wherein: 13. The low-power input device according to claim 8, wherein the input device includes a plurality of data input circuits that receive the transmission data and output the input data controlled by the index signal. Current operated input / output system. 14. An output device for simultaneously outputting a large number of data, comprising: a data storage unit for storing predetermined actual data and providing a large number of the actual data in an output mode; An output circuit for outputting intermediate data corresponding to the data value of the actual data, wherein the intermediate data has a data value of A consuming a current amount of a and the number of the actual data having a data value of A is larger than the current of b. If less than the number of said actual data having a data value of B consuming an amount,
If the number of the actual data having the data value of A is larger than the number of the actual data having the data value of B, the actual data is non-inverted data of the actual data. An output device characterized by the above-mentioned. 15. The output circuit, comprising: a plurality of data output units for respectively sensing the actual data and outputting respective intermediate data corresponding to the actual data; and a plurality of open drain structures for outputting the intermediate data. 15. The output device according to claim 14, further comprising: an output pad unit; and an auxiliary output unit that generates a display signal indicating a correlation between the intermediate data and the actual data. 16. The output circuit, further comprising: a control unit that generates the display signal responsive to the magnitude of the number of the actual data having the B data value with respect to the number of the actual data having the A data value. 16. The output device according to claim 15, comprising an output device. 17. Each of the data output units receives the actual data, and outputs a double output device that outputs inverted and non-inverted data of the actual data, and receives inverted and non-inverted data of the actual data. 16. The output device according to claim 15, further comprising: a selector for outputting the intermediate data. 18. The output device according to claim 17, wherein the dual output device includes a D flip-flop. 19. The control unit for generating the display signal activated when the number of the actual data having the B data value is smaller than the number of the actual data having the B data value. Further comprising: the selector outputs inverted data of the actual data in response to activation of the index signal, and outputs non-inverted data of the actual data in response to deactivation of the index signal. 18. The output device according to claim 17, wherein: 20. A data output method for simultaneously outputting data having a data value of A consuming a current amount of a or a data value of B consuming a current amount of b larger than a, wherein: Sensing the data values of a plurality of actual data having data values; andB) the number (m) of the actual data having the data value of A and the number (n) of the actual data having the data value of B. And C) the result of the comparison in step B) is to invert intermediate data if m ≦ n and generate intermediate data if m> n. A data output method comprising: non-inverting data to generate the intermediate data; and D) generating an index signal indicating a correlation between the intermediate data and the actual data. 21. The data output method according to claim 20, wherein the display signal is activated when m ≦ n. 22. The step C) includes: C1) receiving the actual data and generating inverted data and non-inverted data of the actual data; and C2) receiving the actual data when the indicator signal is activated. Making the inverted data of the data the intermediate data; andC3) making the non-inverted data of the actual data the intermediate data when the index signal is deactivated. Item 22. The data output method according to item 21. 23. An input / output device having an input / output device for simultaneously inputting / outputting a data value of A consuming a current amount of a or a data value of B consuming a current amount of b larger than a. In the data input / output method of the output system, A) sensing data values of a plurality of actual data having respective data values, and B) the number (m) of the actual data having the data value of A and the Comparing the number (n) of the actual data having the data value of B with the intermediate data by inverting the actual data if m ≦ n, Occurs, m> n
If not, generating the intermediate data by non-inverting the actual data; D) generating an index signal indicating a correlation between the intermediate data and the actual data; andE) generating the index signal. Generating predetermined input data for which a correlation with the intermediate data is determined in response to the input data, wherein the input data has the same data value as the actual data. . 24. The data input / output method according to claim 23, wherein the index signal is activated when m ≦ n. 25. The step C) comprising: C1) receiving the actual data and generating inverted data and non-inverted data of the actual data; and C2) receiving the actual data when the indicator signal is activated. Generating inverted data of the data as the intermediate data; andC3) generating non-inverted data of the actual data as the intermediate data when the display signal is deactivated. 25. The data input / output method according to claim 24, wherein: